In accordance with some embodiments of the disclosed subject matter, methods for conducting a transaction using transaction codes are provided, the methods comprising: obtaining information about a trade item associated with the transaction; generating, using a hardware processor, a sale transaction code on a first user device; transmitting the sale transaction code to the first user device; receiving a first input of the sale transaction code on a second user device; generating a confirmation transaction code in response to receiving the first input, wherein the confirmation transaction code includes information about a second user account associated with the second user device; transmitting the confirmation transaction code to the second user device; receiving a second input of the confirmation transaction code on the first user device; and settling the transaction using the second user account in response to receiving the second input.